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Reports concatenation with string literals that consist of one character.
<p>These literals may be replaced with equivalent character literals, gaining some performance enhancement.</p>
<p><b>Example:</b></p>
<pre><code>
  String hello = hell + "o";
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  String hello = hell + 'o';
</code></pre>
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